Pipe-threading machine



March Z9 1927.

B. BoRDEN rms THREADING MACHINE Filed Abril 9. 1924 2 Sheets-Sheetl 1,6 2411 Mmh 29,1927. B BORDEN 2 PI PE THREADING MACHINE Filed Abril 9. 1924 2. Sheets-Sheet' 2 gru/vento@ 61H01 nur lll Patented Mar. 29, 1927.

UNITED STATES BRADFORD BORDEN, 0F CLEVELAND, OI-IO.

PIPE-THREADING MACHINE.

Application led April 9,

The invention relates to improvement-s in pipe threading machines as described in the present specification and illustrated in the accompanying drawings that form a part of the same.

The invention consists essentially of the novel construction and arrangement of parts whereby during the threading operation the dies are Caused to recede and at the end of the cut are automatically freed from engagement with the pipe. y

rlhe objects of the invention are to elimi nate the use of a leader screw and the subsequent necessity of having to turn the machine back over the thread in order to disengage the same; to provide a machine in which the dies are readily interchangeable; to furnish an improved formation of thread cut-ting teet-h which cooperating with a die guiding means facilitates starting of the teeth upon the work; to economize in time and labor in threading pipes, and generally to provide a pipe threading machine which will be inexpensive to manufacture, durable and efficient.

The invention further contemplates a machin-e of this character which is so constructed as to prevent cuttings removed from the work by the teeth from clogging the die holders or otherwise obstructing the proper functioning of the machine.

In the drawings, Figure 1 is a side eleva tion of a pipe threading machine constructed in accordance with my invention;

Figure 2 is a top plan view of the same;

Figure 3 is a detail sectional view on the line 3-3 of Fig. 2;

Figure 4 is a sectional ldetail view on the line 4 4 of Fig. 3;

Figure 5 is a group perspective view of portion of the die holding means, guide post and a portion of one of the dies.

Figure 6 is a plan view of the frame on a reduced scale;

Figure 7 is an elevatipn of one of the guide posts showing a diestock adjusting means;

Figure 8 is a side elevation of a modified form of guide post, and

Figure 9 is a side elevation of a die to cooperate therewith.

Referring specifically to the drawings, wherein like reference characters have been used to denote similar parts throughout all views, a conventional work holding means is illustrated comprising a circular body portion 1 having a central'work receiving open- 1'924. serial No. 705,298.

ing and slidably carrying the work engaging members 2 the 'movement of which is controlled by cam connections with a ring 2a operated by a handle 2b. I provide this body portion with a medial neck 3 which is insertable through the central opening 6 of ay rotatable yoke or die stock support 5 which latter is retained upon said reduced portion 3 by means of a nut or ring` 4. As will loe observed from a glance at Figures 1 and 3, the yoke 5, in addition to being rotatable about the neck 3, is capable of limited axial sliding' movement thereon between the nut 4 and the body portion 1. The purpose of this construction, as will be more fully understood hereinafter, is to admit of the cutting of a shortinitial thread which will be straight and untapered, to enable the die teeth to become properly started in the work without the necessity of a leader screw.

The yoke 5, as seen in Fig. 6 is substantially square the corners thereof being` provided with transverse openings .7 therethrough adapted to snugly receive posts 3 which will be suitably retained therein. These posts form a means for slidablyv supporting a die stock or frame 9 they being adapted upon sliding movement of fsaid frame to cooperate with the dies carried thereby to control the movement of the same toward and from the work in a manner and for a :purpose which will be presently apparent.

The die stock 9 is substantially square, the corners thereof being provided with radially disposed bosses or enlargements 10 extending inwardly to deiine a central work rel ceiving opening concentric with the yoke opening 6. Through these bosses 10 openings 11 are drilled or otherwise produced for loosely receiving` the posts 8 upon which, as previously intimated, the diestock 9 is designed to slide. Each boss is longitudinally slotted throughout its length to define a slideway 13 for the reception of a die 14, it being noted from Figs. 2 and 5 that the post receiving openings are exposed to the slideways 13, and that each die is provided with pins 14a projecting from either side 'for reception in key ways 13a in the sides of their respective slideways. As shown in Fig. 5 the slideways 13 are undercut, overhanging portions 13b serving to prevent vert-icaldisplacement of the dies 14.

Coming now to the die controlling feature of the invention and referring especially to Figs. 1 and 5 it will be seen that the posts 8 are of substantially cylindrical contour each being provided, however, with a fiattened longitudinal face 15 having formed therein a longitiulinal diagonally disposed groove 1G terminating in a laterally directed curve 16a. The posts 8 will be so positioned in the corner holes of the yoke as to present their flat faces 15 toward the slide ways 13 when the die stock 9 is located thereon, it being noted fromFig. 4 that the same extend into the slideways to the extent of the depth of the adjacent kev way 13"1 being thus designed toreceive in their diagonal grooves 16 selected ones of the die pins 14a which may bealined to slide there- Y into preparatory to the slipping of the frame 9 upon the po-sts.

The form of die which it is considered preferable to use is 'one of the double ended type, shown in Figs. 1, 2 and 3, consisting of two sets of teeth 14" and 14C spaced by a slot 14', the set 14b which is the first set to come into contact with the work being set slightly inwardly with respect to the set 14C so that, upon rotation of the die carrying frame 9 with Vits supporting yoke 5, the pipe or other work will be properly gripped and a thread roughed out preparatory to being properlv cut bythe second set of teeth 14C.

Rotative movement will be imparted to the frame 9 and yoke 5 around the portion 3 as an axis by means of handles 17 insertable in sockets 1S of the frame` it being evident that such movement will through the eo-action of the sets of die teeth with the work, cause the frame to slide upon the posts 8 in the direction of the yoke 5. This sliding movement of the frame results in a gradual receding of the dies 14 from the work by reason of the cooperation of the die pins 14n 'withthe diagonal post grooves 16 the dies being completely withdrawn from the work when the pins have located themselves in the laterally curved groove terminals 16a. This gradual receding of the dies from the work as a thread is cut thereon assures al desirable tapering of the thread to cause the proper binding of a nut thereon. VAs the distance from the sets of 'die teeth 14", 14C, to each pin 14n varies, it will be noted that the distance which the dies extend into the pipe or work opening is determined byplacing selected die pinsl 14 in the post grooves 16. The number of sizes of work which may be threaded with one set of dies is, therefore, limited only by the number of pins 14L which may be conveniently placed on the dies, such of the pins as are not cooperating with a post groove being free to slide in the keyways 13a. i

In Figs. 8 and 9 a modified form of construction is illustrated, the posts 19 being here provided with diagonal ribs 19a cooperable with selected edge grooves 20*L of dies 20.

As a means for retaining the die stock or frame 9 upon its guide posts 8 I employ the adjusting screw 21, best illustrated. iu Fig-V ures 1, 2 and 7, the same including' a threaded shank 2Q adapted to be screwed into a tapped aperture in one of the posts 8, a depending skirt 23 sni'i'(.uiuding this shank co operating with the upper surface of the frame 9 to constitute an adjustable stop therefor whereby the outward thrust of the diestock 9 may be regulated.

The advantage of his construction will be obvious since by the setting of the screw 21 at predetermined points on the post the ini.- tial extent to which the dies 14 protrude into the work receiving opening ofthe die holder 9 may be controlled. Limiting of the outward thrust of the die holding frame 9 prevents the grooves of the posts 8 from acting upon the die pins 14" to insert the dies transverse into the work receiving opening to the limit Y of their movement. It will also be obviousl that the screw 21 may be used to determine the length of thread toV be cut by limiting the outward movement of the die holder, acting as a gauge in this respect and'also in determining the initial bite of the dies in various sizes of work. are provided upon the screw receiving post 8 so that desired adjustments may be quickly and readily made. Removal of the screw 22 of course permits changing the relative positions of the dies with respectto the work by sliding the same to bring other pins 14a linto registry with the post grooves 16.

From the foregoing description read in connection with the accompanying drawings it is believed that the novel features of construction of my machine will be readily understood and appreciated by Athose skilled in the art.

The operation may be summarized as follows:

The pipe or other work to be threaded will be .engaged in the work holder, the portion to be operated upon being projected through the yoke 5 and the die stock 9 in the usual manner. It is to be understood that the end of the work to be threaded will be so located as to be engaged by the teeth 14" of the die member 14 when the die holding frame 9 is in elevated positi'on. The inwardly tapered formation of this set of teeth in conif nection with the receding movement of the dies 14 greatly facilitates the starting of the thread. Y

Rotary movement is imparted to the die stock 9 and yoke 5 `by means ofthe handles 17 causing the teeth 14" to bite into the pipe to form a roughened or starting surface thereon. Since, as will be remembered, the yoke 5 carrying the diestock 9 is ca able of limited axial sliding movement on t e neck Graduations E24 3 (Fig. 3) the entire assembly will be caused to move downwardly thereon from the nut l, to the body portion l of the work holding means. It will now be readily understood that this initial operation has not caused the dies to start their receding movement, its purpose being to facilitatev the starting of die portions lei upon the work. rlfhe necessity of so called leader screws usually employed for this purpose is thus obviated.

Upon the completion of this initial operation, the yoke 5 now being at the limit of its downward movement with the die teeth well started upon the work, continued rotation of the diestock 9 will cause the same to move downwardly, the dies 14 .meanwhile gradually receding from the work by reason of their sliding connection with the grooves 16 of the posts 8. The teeth lll following the teeth 14') are adapted to accentuate the cut made by the teeth lill) and produce a thread of desired size.

Continued rotation of the diestock results in the pins 11i being brought into cooperation with the grooves 16 which causes acceleration of the recession of the dies 13 to completely disengage them from the work,

and permit removal of the same from the machine without necessitating rotation of the diestock 9 in the reverse direction as is true in pipe threading machines which include a leader screw. Obviously a plurality of dies for forming either right or left hand threads of varying pitch may be used.

Since the dies are projected well into the work receiving opening to engage the work, cuttings therefrom will be permitted to fall through the opening and will not accumulate in the vicinity of the bosses l0, and since no leader screw is interposed between the plate l and the diestock 9 this disposition of the cuttings is unobjectionable.

l claim as my invention:

l. A pipe threading machine including a die stock, a series of work engaging dies carried thereby, guide means for slidably mounting said die stock for movement parallel with the axis of the work, and said dies and guide means having portions slidably inter-engaging each with the other, one of said portions being a groove extending obliquely with respect to the axis of the work whereby through co-action with said other portion to actnate the dies transversely with respect to the axis of the work daring the slidingl movement of said die stock.

9. A pipe threading machine includingl a die stock. a series of work engaging dies carried thereby, guide means for slidably mounting said die stock for movement parallel with the axis of the work, and said dies and guide means having portions slidably inter-engaging each with the other, one of said portions having a groove extending obliquely with respect to the axis of the work whereby through said other portion to eifect a gradual receding of the dies. from the work during the threading operation, and one end of said groove being directed transversely away from the axis of the work whereby to effect a complete disengagement of the dies therefrom at the completion of the threading operation.

3. A pipe threading machine including a dicstock, a series of work engaging dies carriedthereby, a support, guide posts carried by said support for slidably mounting said diestock for movement parallel with the axis of the work and each of said posts having a longitudinal groove therein obliquely disposed with respect to the axis of the work, and said dies having means for sliding engagement in said grooves during the sliding movement of said stock on said posts whereby the dies will be gradually recededfrom the work for cutting a tapered thread thereon.

A pipe threading machine including a support, posts carried by said support, a die stock slidably carried by said posts, dies" radially arrai'iged in said stock, and a groove and pin connection between said dies and posts, said groove extending obliquely with respect to the of the work whereby the dies will be receded therefrom when the die stock is slid in one direction and actuated theietoward when the die stock is moved in the opposite direction, and said groove and pin connection constituting` a means for removably retaining said dies in saiddie stock.

5. A pipe threadingmachine including a support, posts carried by said support and having flat faces, said faces having grooves running in the direction of the length of said posts and ohliquely disposed with respect to the of the work, a die stock removably positioned upon and slidably carried by said posts, dies slidably arranged in said stock. said dies having pins extending from thesides thereof, and `said post grooves being open at the ends of posts for the .selective reception of said pins.

G. .ai pipe threading machine including a support, posts arried by said support and parallel with the airis of the work, said poss having grooves` inclined across the axes thereof and extending therealong, a die stock slidablj.' ca'iied by said posts. dies freely movable in said die stock, each die having a plurality of pins extending from the side; thereof. said post grooves being ogencd at tac ends oi" said posts whereby to receive selected pins ot lsaid die; for locating the worl; engaging die portions in a pre; detc mined position .according to the size of work to be threaded.

7. A pipe threading machine including a die stock con'iprising a substantially square plate having' a work receiving opening, bosses radiating from said work receiving opening toward the corners of said plate, said bosses having longitudinal die receiving slots therein and transverse post receiving holes communicating` with said slots, dies Y slidably receivable in said slots and having pins projecting from the sides thereoi, posts loosely receivable in said post holes for slidably mounting said die stock on a support, said posts having longitudinal grooves therein and disposed obliquely with respect to the axis otthe Work, and said grooves having one end open tor the reception ot said die pins, the opposite ends ot said grooves being turned laterally in a direction away trom the axis oi' the Work.

8. In a pipe threading machine including a die stock, a series ot vvorlr engaging dies carried thereby, guide means tor slidably mounting said die stock for movement parallel With the axis ot the Work, said dies and guide means having portions slidably interengaging each With the other and arranged to actuate the dies transversely with re spect tothe axis ot the Work during the sliding movement the die stock, and a gage means carried by said guide means and engaging said die stock for limiting movement of the same in a direction to project the dies tovvard the Work.

9. A pige threading machine including a die stock, a Vseries ot Work engagingdies carried thereby, guide means tor slidably mounting said die stock for' movement parallel with the axis ot the Worlr, said dies and guide means having portions slidably inten engaging each with the other, one oli said portions being` a groove extending obliquely with respect to the axis ot" the work whereby through co-action with said other portion to actuate the dies transversely With respect to the axis of the Work during the sliding movement of said die stock, and gage means acting upon said die stock tor' retaining the same against displacement, and said gage means being adjustable to limit movement otsaid die stock in a direction to project the dies toward the Worx.

l0. A ,pipe threading machine including a support, posts carried by said supportand having iiat faces, said faces having grooves running in the direction of the length of said posts and obliquely disposed With respect to the axis of the work, a die stock removably positioned upon and slidably carried by said posts, dies slidably arranged in said stock, said dies having pins extending from the sides thereof, said post grooves being open at the ends of said posts for the selective re` ception of said pins, and gage means car ried by one of said posts and acting upon said die stock Jfor retaining the same against displacement, said gage means being adjustable to limit moven'ient oit said die stock in a direction to project the dies toward the Worlr.

1l. A pipe threading machine including a die stock, a series ot work egaging dies carcied thereby, guide means for slidably nounting said die stoclc'ior movement parallel with the axis ol the work, and said dies and guide means having portions slidably inter-engaging each With the other, one oit said portions being a groove extending ob liquely with respect to the axis ot the Work whereby through said other portion to effect a gradual receding of the dies from the work during the threading operation, one end ot said groove being directed transversely away trom the axis of the vvork whereby to iecta complete disengagement ot the dies therefrom at the completion of the threading operation, and gage means carried 'by said guide means for retaining said die stoel: against displacement, said gage means being adjustable to limit movement of said die stock in a direction to project the dies to- Ward the Work.

l2. A pipe threading machine including a base, a rotatable member carried bv said base and capable et limited axial sliding movement thereon, a diev stock, a series oit Work engaging dies carried thereby, guide means for slidably mounting said die stock upon said member for movementparallel with the axis of the Work, said dies and guide means having portions slidably interengaging each with the other and arranged to actuate the dies to recede from the work during the relative sliding movement olf said die stock with respect to said member, and gage means carried by said guide means and acting upon said die stock for retaining the same against displacement, said gage means being adjustable to limit movement of said die stock in a direction to project the dies toward the Work.

13V. In a` pipe threading machine, a die stock having means controlled by the axial movement ot the die stock in one direction tor progressively actuating the dies toward the Work, a member with respect to which the die stock is movable in an axial direction, means for indicating the proper extent ot movement of the die stock in the first mentioned direction of axial movement to project the dies to the appropriate startl ing position for predetermined sizes ot Work, said indicating means comprising a fixed and a movable'element, and one ot said elements being said aforementioned member.

In testimony whereof I have signed this specification.

BRADFORD BORDEN. 

